Ooh feel for you mate. I had spinal surgery in 08. Didnt have the titanium discs though as they said i was too young (24 at the time), so i had a Wallis Ligament procedure. Still had to cut a massive hole in my back for it!
Anyway - they absolute key thing to recover is you NEED physio, and lots of it. As they've sliced into your back, you have no muscle control there, so your body doesnt hold your spine in place, meanning the pain will soon return...!
PM me if you need any advice on it mate, as i've been through all this and i know its no fun!